44results about How to "Increase light output power" patented technology

The present invention relates to a vertical resonant cavity surface emitting laser diode (VCSEL) with multiple current confinement layers, that is, a VCSEL with multiple current confinement layers. Generally, a tunnel junction layer needs to be arranged between the two active layers to allow the current from One active layer flows into the other active layer, but the tunneling junction layer will cause the current to diverge seriously in one active layer, making it difficult for the current in the other active layer to be confined to the desired area. A current confinement layer with carrier and light confinement functions is provided between, so that the carrier or light confinement effect of the active layer above and / or below the current confinement layer can be improved, which is helpful to improve the optoelectronic properties of the VCSEL Compared with the existing VCSEL, the VCSEL with multiple current confinement layers can significantly improve the optical power, slope efficiency and power conversion efficiency of the VCSEL.

The invention discloses a liquid flow non-immersive measuring device and a sensing probe. The liquid flow non-immersive measuring device comprises the sensing probe and is characterized in that the sensing probe is connected with a circulator through an optical path, light emitted by a pump light source of 980nm is received by the circulator through a separator, optical signals output by the circulator is sent to a coupler through the separator, two optical signals are output by the coupler, one signal is sent to a first Faraday rotary mirror through a phase modulator, and the other signal is directly sent to a second Faraday rotary mirror; the optical signals output by the coupler are sent to a photoelectric detector, electric signals output by the photoelectric detector enter a phase carrier wave demodulating device, weak dynamic variation of the wave length of a DFB optical fiber laser is demodulated, and flow is calculated according to the variation of the wave length; the sensing probe relates to a section of asymmetric phase shifting optical fiber grating fixed on the outer wall of an oil pipe in the circumferential direction.

Embodiments of the present invention provide a vertical cavity surface emitting laser array with uniform light output power and a manufacturing method thereof. The array includes: a plurality of vertical cavity surface emitting laser units; for any two vertical cavity surface emitting laser units, the first vertical cavity surface emitting laser unit The resistance of the surface-emitting laser unit is greater than the resistance of the second vertical-cavity surface-emitting laser unit; wherein, in any two vertical-cavity surface-emitting laser units, the distance between the first vertical-cavity surface-emitting laser unit and the center of the vertical-cavity surface-emitting laser array, less than the distance between the second VCSEL unit and the center of the VCSEL array. The vertical-cavity surface-emitting laser array with uniform light output power and the manufacturing method thereof provided by the embodiments of the present invention are highly integrated on the basis of highly integrated vertical-cavity surface-emitting laser units, without increasing the area of ​​the array and without changing the layout design of the mesas. The uneven junction temperature distribution of the array is improved, and the uniformity and stability of the light output power can be improved.

Provided is an optical fiber distributed type sound wave monitor system. Narrow-linewidth frequency-modulated lasers output by a frequency modulation DFB fiber laser are used as the light source of the optical fiber distributed type sound wave monitor system, the lasers output by the frequency modulation DFB fiber laser enter an acoustic optical modulator and are modulated to be pulse lasers through the acoustic optical modulator, the pulse lasers pass through a first optical amplifier and a first optical filter and then enter a second circulator and sensor fibers, the pulse lasers per unit can emit rayleigh scattering light within the range of the passed sensor fibers per unit length, and signals output by the second circulator pass through a second optical amplifier to enter a second optical filter and output backscattering rayleigh signals. The backscattering rayleigh signals between different unit lengths on one sensor fiber are interfered with the method of an interferometer, the interfered signals pass through electrical signals output by a second photoelectric detector and enter the optical fiber distributed type sound wave monitor demodulation system though a phase carrier demodulation module, and the change analysis of the phases of the sensor signals at corresponding positions is achieved.